Polymyxin-B

Antibiotic Sensitivity disc are used to determine the effectivness of an antibiotic against a microorganism as a guide to antibiotic therapy. The disc consist of a specific concentration of an antibiotic in mcg which is tested against a microorganism of a standard density, swabbed uniformly on an appropriate media following overnight incubation. Polymyxin-B is impregnated on a filter paper disc of specified concentration. Both sides of the disc are printed with PB and concentration 300units for easy identification.